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Sodium nitrate can appear in a variety of physical forms, from powdery or granular in consistency, to a more solid rhombohedral crystal. When this compound is in its purest state, the sodium nitrate appears transparent to white in color. If impurities are present in the compound, sodium nitrate may look gray, lemon yellow or reddish brown in color. Sodium nitrate is also very soluble in water, meaning it dissolves easily.